Does this Error by any chance come from your mod? It says:
- TRANSPILER visibleraidpoints.1trickPonyta: IEnumerable`1 VisibleRaidPoints.Patch_ChoiceLetter_OpenLetter:Transpiler(IEnumerable`1 instructions)

Resulting in me not being able to open the join request letter and getting this error instead:


Root level exception in OnGUI(): System.NullReferenceException: Object reference not set to an instance of an object
[Ref A4718F5E]
at RimWorld.ChoiceLetter_AcceptJoiner.get_MapToUse () [0x0000a] in <cb53cd4422904947932d33f561ad8d15>:0
at RimWorld.ChoiceLetter_AcceptJoiner+<get_Choices>d__10.MoveNext () [0x000c9] in <cb53cd4422904947932d33f561ad8d15>:0
at System.Collections.Generic.List`1[T].AddEnumerable (System.Collections.Generic.IEnumerable`1[T] enumerable) [0x00059] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.Collections.Generic.List`1[T].InsertRange (System.Int32 index, System.Collections.Generic.IEnumerable`1[T] collection) [0x000f4] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.Collections.Generic.List`1[T].AddRange (System.Collections.Generic.IEnumerable`1[T] collection) [0x00000] in <51fded79cd284d4d911c5949aff4cb21>:0
at Verse.ChoiceLetter.OpenLetter () [0x0001d] in <cb53cd4422904947932d33f561ad8d15>:0
- TRANSPILER visibleraidpoints.1trickPonyta: IEnumerable`1 VisibleRaidPoints.Patch_ChoiceLetter_OpenLetter:Transpiler(IEnumerable`1 instructions)
at Verse.Letter.DrawButtonAt (System.Single topY) [0x0031b] in <cb53cd4422904947932d33f561ad8d15>:0
at Verse.LetterStack.LettersOnGUI (System.Single baseY) [0x00084] in <cb53cd4422904947932d33f561ad8d15>:0
- PREFIX RimHUD: Boolean RimHUD.Access.Patch.Verse_LetterStack_LettersOnGUI:Prefix(LetterStack __instance, Single& baseY)
at RimWorld.GlobalControls.GlobalControlsOnGUI () [0x001f4] in <cb53cd4422904947932d33f561ad8d15>:0
- TRANSPILER GonDragon.UINotIncluded: IEnumerable`1 UINotIncluded.GlobalControl_TranspilerPatch:Transpiler(ILGenerator gen, IEnumerable`1 instructions)
- PREFIX rimworld.aRandomKiwi.RimTheme: Boolean aRandomKiwi.RimThemes.GlobalControls_GlobalControlsOnGUI_Patch:ListenerPrefix()
- POSTFIX rimworld.aRandomKiwi.RimTheme: Void aRandomKiwi.RimThemes.GlobalControls_GlobalControlsOnGUI_Patch:ListenerPostfix()
at RimWorld.MapInterface.MapInterfaceOnGUI_BeforeMainTabs () [0x00139] in <cb53cd4422904947932d33f561ad8d15>:0
- PREFIX GonDragon.UINotIncluded: Void UINotIncluded.MapInterfaceOnGUI_BeforeMainTabsPatch:Prefix()
at RimWorld.UIRoot_Play.UIRootOnGUI () [0x0001f] in <cb53cd4422904947932d33f561ad8d15>:0
- POSTFIX net.pardeike.rimworld.mod.camera+: Void CameraPlus.UIRoot_Play_UIRootOnGUI_Patch:Postfix()
at Verse.Root.OnGUI () [0x00046] in <cb53cd4422904947932d33f561ad8d15>:0
- POSTFIX UnlimitedHugs.HugsLib: Void HugsLib.Patches.Root_OnGUI_Patch:OnGUIHookUnfiltered()
- POSTFIX net.pardeike.rimworld.mod.camera+: Void CameraPlus.Root_OnGUI_Patch:Postfix()
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch4 (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root.OnGUI_Patch2 (Verse.Root)